“It is shocking and disgraceful that a Conservative MEP thinks people should face treason charges because they disagree with him on Brexit. If his aim is to intimidate those of us who support a People's Vote on a final Brexit deal into silence I can only tell him he will fail.

“In the meantime, Theresa May should make it clear she won't be party to such campaigns of political bullying. It is appalling that there are people who want to deepen divisions on this issue rather than allowing a rational debate about how we face up to what is now becoming a serious national crisis."